Device and method for measuring crude oil with low air void

Abstract

The invention discloses a device and a method for measuring crude oil with low air void, belonging to the technical field of fluid measurement. The device for measuring crude oil with low air void comprises a measurement pipeline, a capacitance transducer at the front end of the measurement pipeline, a flow mixer at the middle of the measurement pipeline, a Coriolis mass-flow meter and a pressuretransducer at the rear end of the measurement pipeline, an A / D switch card and a computer. The capacitance transducer, the Coriolis mass-flow meter and the pressure transducer are connected with the computer via the A / D switch card. The invention also provides a measurement method adopted by the device. The invention has the advantages of small volume, simple structure, convenient installation, more obtained measurement parameters, high detection precision of the parameters, good real time measurement, high reliability, easy implementation and the like, and is suitable for measuring crude oilwith low air void in oil field.

Description

technical field [0001] The invention belongs to the technical field of fluid measurement, and in particular relates to a device and method for measuring the phase holdup of crude oil with low gas content and the flow rate of each phase. Background technique [0002] Crude oil is a typical multiphase flow, generally including oil, gas and water three-phase substances. The three phases of oil, gas and water interact in the flow process, and it is very difficult to detect the flow rate of the separated phases. However, for the rational development of oil fields, the oil production, water production and gas production of each oil well must be mastered. At present, most oil fields use the separation metering method to measure the phase-separated flow rate of crude oil. Separation measurement method is generally divided into complete separation method and partial separation method. [0003] The complete separation method is a traditional metering method in the oil field. This m...

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Problems solved by technology

The problem with this method is that the gas-liquid ratio of the fluid in the sampling part is often different from the gas-liquid ratio in the original flow, and the sampling ratio is easily affected by flow patterns and flow fluctuations.

However, the gas-liquid separation effect of the partial separation method is poor, and a certain amount of gas is often mixed in the liquid phase. The mixed gas has a great impact on the measurement accuracy of the liquid phase flow rate, and also affects the accurate measurement of the gas flow rate.

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